关键词: “一江两河”, “一江两河”, 紫花苜蓿, 灰色关联度, 综合评价, 生产性能

Abstract: The paper aims to analyze the distribution features of microelements in different ages as well as different harvest periods and organs (leaves, stems, shoots) of three varieties of Moringa in Xishangbanna (e.g, Moringa oleifera, Moringa stenopetala and Moringa PKM1). The results revealed that: there were significant differences of microelements content in young shoots and old shoots of different varieties, ages and harvest periods. In all varieties, iron (Fe) showed the highest content, followed by manganese (Mn) and zinc (Zn), while copper (Cu) content was the lowest. The content of Fe in leaves was lower than that in stems, however the content of Zn and Mn was higher in leaves than that in stems. The microelements contents in young shoots were higher than that in old shoots except Zn. As regard to different varieties, Moringa oleifera had the highest Zn and Fe content, followed by Moringa PKM1 and Moringa stenopetala. Moringa stenopetala had the highest Mn content, followed by Moringa oleifera and Moringa PKM1. Interestingly, the Fe content of Moringa spp increased progressively with the tree age increase, but Mn and Zn content declined. Fe and Zn content were lower in summer, but Mn content was lower in winter. The difference of Cu content of different varieties, ages and harvest periods was not significant.